Floor-jack.



A. KRAEMER.

FLOOR JACK. k APPLICATION FILED MAR. 15, 1913.

. 1,086,374, Patented Feb. 10, 1914.

Yvwamtoz new? Zme men y M 33 UNITED STATES PATENT OFFICE.

ADAM KBAEMER, OF RICHMOND, MINNESOTA.

FLOORFJACK.

To all whom it may concern Be it known that I, ADAM KRAEMER, a citizen of the United States, residing at Richmond, in the county of Stearns, State of Minnesota, have invented certain new and useful Improvements in FloorJacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in floor jacks.

One object of the invention is to provide a floor jack which when operated to force a floor board in proper position, will remain in such engaged position without any tendcncy to release itself.

Another object is to provide a device of this character which is simple and cheap and which is easily operated.

Other objects and advantages will be ap parent from the following description when taken in connection with the accompanying drawings.

In the drawings: Figure 1 is a side elevation of a floor jack made in accordance with my invention. Fig. 2 is a top plan view. Fig. 3 is a vertical longitudinal sectional view on the line 3-3 of Fig. 2. Fig. 4 is a vertical transverse sectional view on the line 4lof Fig. 2.

Referring particularly to the accompanying drawings, 10 represents a housing which is formed preferably of metal, and which may be cast in one piece, or made in a number of pieces bolted together as desired. Formed vertically and longitudinally through the greater portion of the housing is a slot 11, in the opposite walls of which are formed the guide ribs 12. Mounted in this slot 11 is a block 13 which is formed in its opposite side faces with the grooves 14 which receive the beforementioned ribs 12 for guiding the block in positive longitudinal movement in the slot. Formed in the upper side of the block 13 at the inner end is a recess 16, this recess having the forward vertical wall 17 and the rear curved wall 18, this wall extending from the upper side of the block down to the lower end of the vertical wall 17. Mounted in the side walls of the slot 11 and passing through the recess 16 is a pivot pin 19 on which is mounted a cam Specification of Letters Patent.

Application filed March 15, 1913.

Patented Feb. 10, 1914.

Serial No. 754,404.

20, this cam being provided with a suitable hand-lever 21, projecting above the housing. This cam 20, as will be clearly seen in the drawing, is disposed within the recess 16 and is adapted to bear with its opposite end faces, respectively, against the walls 17 and 18 to accomplish the longitudinal movement of the block in the slot 11. In the rear end of the housing on the lower side is formed a sharpened point 22, which is adapted to be driven into the oint to anchor the device for use.

The use of the device in its operation may be briefly described as follows: The housing is placed on the joist close to the floor board to be clamped, so that the point 22 is driven into the joist. This point may be driven either by tapping the housing with a hammer, or else, driving the same against the joists so that the point 22 will enter the joist under the weight of the housing.

l/Vhat is claimed is:

1. A floor jack comprising a housing having a vertical longitudinal opening through the greater portion of its length, ribs on the walls of the opening, a block vertically disposed in the opening and provided with grooves for slidable reception of the said ribs, the upper portion at one end of the block being formed with a recess, and a vertically disposed cam lever pivotally mounted between the walls of the opening of the housing and within the recess of the block.

2. A floor ack comprising a base member having means at one end for penetrating a joist, said member being vertically bifurcated throughout the greater portion of its length, a board engaging block slidably mounted within the bifurcation and movable longitudinally therein, said block having a notch formed in its upper portion near one end, the forward wall of the notch being vertical, and the other wall longitudinally concaved. a pin mounted transversely in the bifurcation, and a. vertically disposed cam lever having its cam head mounted on the said pin and disposed between the bifurcations and within said notch.

In testimony whereof, I afliX my signature, in the presence of two witnesses.

ADAM KRAEMER. Witnesses:

JOHN KRAEMER, J OHN L. KUMMER.

Copies 01 thil patent may be obtained for five cents each, by addressing the Commissioner of 2mm,

Walhington, D. 0. 

